## [1] Scatter with geom_smooth() best fit line:

## [1] The best fit line captures the overall trend but misses out on quite a bit of information such as large fluctuations that appear when PM2.5 = 8-9.
## [1] Scatter with linear model best fit line:

## [1] The linear model shows that higher amounts of PM2.5 in the bay area is correlated with higher amounts of ED visits for asthma. Specifically, an increase of 1 microgram/cubic meter of PM2.5 is associated with an increase of 19.862 ED visits for asthma per 10,00 people; 9.6% of the variation in PM2.5 is explained by the variation in ED visits for asthma.